<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Three框架</title>
    <script src="../js/Three.js"></script>
    <style type="text/css">
        div#canvas-frame {
            border: none;
            cursor: pointer;
            width: 100%;
            height: 600px;
            background-color: #EEEEEE;
        }

    </style>
</head>

<body onload="threeStart();">
<div id="canvas-frame"></div>
<script>
    var renderer;
    function initThree() {
        width = document.getElementById('canvas-frame').clientWidth;
        height = document.getElementById('canvas-frame').clientHeight;
        renderer = new THREE.WebGLRenderer({
            antialias : true
        });
        renderer.setSize(width, height);
        document.getElementById('canvas-frame').appendChild(renderer.domElement);
        renderer.setClearColor(0xFFFFFF, 1.0);
    }

    var camera;
    function initCamera() {
        camera = new THREE.PerspectiveCamera(45, width / height, 1, 10000);
        camera.position.x = 0;
        camera.position.y = 1000;
        camera.position.z = 0;
        camera.up.x = 0;
        camera.up.y = 0;
        camera.up.z = 1;
        camera.lookAt({
            x : 0,
            y : 0,
            z : 0
        });
    }

    var scene;
    function initScene() {
        scene = new THREE.Scene();
    }

    var light;
    function initLight() {
        light = new THREE.DirectionalLight(0xFF0000, 1.0, 0);
        light.position.set(100, 100, 200);
        scene.add(light);
    }

    var cube;
    function initObject() {

        var geometry = new THREE.Geometry();
        var material = new THREE.LineBasicMaterial( { vertexColors: true } );
        var color1 = new THREE.Color( 0x444444 ), color2 = new THREE.Color( 0xFF0000 );

        // 线的材质可以由2点的颜色决定
        var p1 = new THREE.Vector3( -100, 0, 100 );
        var p2 = new THREE.Vector3(  100, 0, -100 );
        geometry.vertices.push(p1);
        geometry.vertices.push(p2);
        geometry.colors.push( color1, color2 );

        var line = new THREE.Line( geometry, material, THREE.LinePieces );
        scene.add(line);
    }

    function threeStart() {
        initThree();
        initCamera();
        initScene();
        initLight();
        initObject();
        renderer.clear();
        renderer.render(scene, camera);
    }

</script>
</body>
</html>
